Contact for electric lamps



(No Model.)

H. EDMUNDS, Jr.

CONTACT FR 'ELECTRIC LAMPS.

Patented Nov. 13, 188.3.'

No. 288.2l8.

N. Prrrns. mwuxmw. mmm n.4.:

UNITED STATES PATENT EEIOE.

HENEY EDMUNDS, JE., OE NEW YOEE,l N. Y., AsSIeNOE To THOMAS' J. MONTGOMERY, OE BOSTON, MASSAOHUSETTS.

GONTACT FOR ELECTRIC LAMPS.

SPECIFICATION forming part of Letters Patent No. 288,218, dated November 13, 1883.

Application ined April 5, less. (No modem l liers, orother ixtures, and is intended to in sure perfect metallic kcontact and to allow for connecting or-disconnecting the lamp with rapidity.

In the drawings, Figure 1 is an elevation of the lamp complete. Fig. `2 is a vertical section of the socket containing the contacts. Fig. 3 is an inverted pian of the spring-contacts, and Fig. 4. is a'plan'oi the contact-Studs. The electric lamp Ais provided with a glass globe, an incandescingcarbon filament, and with conductors passing through the glass,and the same is Supported above the base B by a spring, C; and there are hooks d at the ends of the conductors to which the Wires of the lamp are hooked; but these devices have before been made, and are not my invention. I also remark that any suitable incandescent lamp ments nent described.

The base B is of insulating material, and it is received into the upper end of the metallic cup F, that is screwed upon the tubular support G, that forms part of the bracket, chandelier, or other support; and usually there will be a switch at H for turning the current on or off; vbut this switch does not form part of my present invention.

Within the @up E there is a. bloei-i, S, of iiisulating material screwed firmly to the end of G. The insulated electric conductors k pass through the tube G and are clamped to the may be employed with my improvef contact-platesZ Z by the screws i, the naked Wire being twisted around under the screwheads.

Upon the respective plates Z Z there are con tact-studs o o', and uponthe under side of the base B there are the spring-contacts n w/,Shown in Figs. 2 and 3. Each spring has a hole through it for the Wi're of the spring-hook d. to pass through and be twisted around beneath the screw-head t, so as to be Secured firmly at the same time as the spring is fastened to the base B. Each spring is bent away yfrom the base, so that its free end can yield` and the parts are placed so that when the base B is inserted into the cup F and the studs r of the base enteredinto the bayonet-lock slots of the cup, the springs n n Will come over the contact-studs o 0'; and as the base B is pan tially revolved to turn the studs r. into the horizontal portions of the bayonet-lock, the springs Jn. n come into contact rmly with the studs o o with a rubbing motion that prevents any particles of foreign matter remaining between the metallic surfaces, hence insuring per fect metallic contact.

I claim as my invention- The combinatiomwith theincandescing electric lamp A, of the base B, the cup F, contactplates Z Z', and Studs, the insulating-block S, to which the plates Z Z are screwed, and the con- .tactsprings u n. upon the inner side ofthe base B,to which the spring-conductors are attached, and the bayonet-locks `for connecting the cup and base, substantially as set forth.

` Signed by me this 29th day of March, A. D. y 1883.

HENRY EDMUNDS, JR. Witnesses:

GEO. T. PINOKNEY,

WILLIAM G. MOTT. 

